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The CPU Bus controller is the (SCPCNT-GA) that is directly connected to the CPU.
This controls the following functions
-CPU Control
-SMI Clock
-CPU Clock Control
-Memory Control
-64 bit bus Memory Control
-32 bit bus Memory Control
-Bus Control
-64 to/from 32 bit data bus width convert.
-32 bit local bus control
-Address latch control
-address convert
-address latch
-I/O Register
-register restoring for resume
-special register